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Phospholes as ligands for rhodium systems in homogeneously-catalysed hydroformylation reactions

1989; Science Press; Volume: 53; Issue: 2 Linguagem: Inglês

10.1016/0304-5102(89)85007-2

1873-3131

Denis Neibecker, Régis Réau,

Synthesis and characterization of novel inorganic/organometallic compounds

The stereoelectronic properties of various phospholes were determined and discussed in terms of Tolman's electronicν and steric θ parameters. The selected phospholes, associated with rhodium, were used in the catalytic hydroformylation of 1-hexene and compared to triphenylphosphine under typical hydroformylation conditions (80 °C, 20 bar syngas). One phosphole, namely 1,2,5-triphenylphosphole (TPP), has been found to be by far superior to triphenylphosphine (about 10 times more active and 10% more selective). Most importantly, the rhodium-TPP system does not seem to be sensitive to the P/Rh ratio.